<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      ul {
        list-style: none;
        width: 600px;
        height: 600px;
        background-color: aqua;
        margin: 100px auto;
      }
      li {
        width: 200px;
        height: 300px;
        border: 1px solid #000;

        /* 浮动 */
        float: left;
      }
      li:first-child {
        height: 600px;
        background-color: red;
      }
    </style>
  </head>
  <body>
    <ul>
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
    </ul>
  </body>
</html>
